21333433307 has 2 divisors, whose sum is σ = 21333433308. Its totient is φ = 21333433306.

The previous prime is 21333433283. The next prime is 21333433313. The reversal of 21333433307 is 70333433312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21333433307 - 2¹⁰ = 21333432283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21333433327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666716653 + 10666716654.

It is an arithmetic number, because the mean of its divisors is an integer number (10666716654).

Almost surely, 2^21333433307 is an apocalyptic number.

21333433307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333433307 is an equidigital number, since it uses as much as digits as its factorization.

21333433307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 32.

Adding to 21333433307 its reverse (70333433312), we get a palindrome (91666866619).

The spelling of 21333433307 in words is "twenty-one billion, three hundred thirty-three million, four hundred thirty-three thousand, three hundred seven".